class_docstr: ## [History](../index.html#History)
  
  This defines when a game ends, calculates the utility and sample chance events (dealing cards).
  
  The history is stored in a string:
  
  * First two characters are the cards dealt to player 1 and player 2
  * The third character is the action by the first player
  * Fourth character is the action by the second player
docstr: Information set key for the current history.
  This is a string of actions only visible to the current player.
docstr_tok: ["Information","set","key","for","the","current","history",".","This","is","a","string","of","actions","only","visible","to","the","current","player","."]
code: def info_set_key(self) -> str:
      """
      Information set key for the current history.
      This is a string of actions only visible to the current player.
      """
      # Get current player
      i = self.player()
      # Current player sees her card and the betting actions
      return self.history[i] + self.history[2:]
  
imports: from typing import List, cast, Dict
  import numpy
  from labml import experiment
  from labml.configs import option
  from labml_nn.cfr import History, InfoSet, Action, Player, CFRConfigs
  from labml_nn.cfr.infoset_saver import InfoSetSaver
label_desc: Use image node_id 10 for calling the History obj's underlying member method code with example usage: obj.info_set_key() and returns: unknown